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Oxygen isotope equilibrium in brachiopod shell fibres in the context of biological control

  • M. Cusack (a1), A. Pérez-Huerta (a1), P. Chung (a1), D. Parkinson (a2), Y. Dauphin (a3) and J.-P. Cuif (a3)...


With their long geological history and stable low-Mg calcite shells, Rhynchonelliform brachiopods are attractive sources of environmental data such as past seawater temperature (Buening and Spero, 1996; Auclair et al., 2003; Brand et al., 2003; Parkinson et al., 2005). Concerns about the influence of vital effects on the stable isotope composition of brachiopod shells (Popp et al., 1986), led to isotope analyses of different parts of brachiopod shells in order to identify those parts of the shell that are influenced by any vital effect and those parts that may be suitable recorders of seawater temperature via stable oxygen isotope composition (Carpenter and Lohmann, 1995; Parkinson et al., 2005). Such detailed studies demonstrated that the outer primary layer of acicularcalcite is isotopically light in both δ18O and δ13C while the secondary layer, composed of calcite fibres, is in oxygen-isotope equilibrium with ambient seawater(Fig. 1) (Parkinson et al., 2005).


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Oxygen isotope equilibrium in brachiopod shell fibres in the context of biological control

  • M. Cusack (a1), A. Pérez-Huerta (a1), P. Chung (a1), D. Parkinson (a2), Y. Dauphin (a3) and J.-P. Cuif (a3)...


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